Table 1.

General clinical parameters, operation time, and perioperative red blood cell count in four groups (n = 75 per group)

Group	Male/female, n/n	Age, years	Body weight, kg	HBP, n (%)	Cardiac disease, n (%)	Pulmonary disease, n (%)	Duration of anesthesia, min	Perioperative RBC transfusion volume, mL	Highest education level (JHS/HS/college or higher), n/n/n
C	35/40	82.5 ± 7.5	72.9 ± 14.6	16 (21.3)	25 (33.3)	19 (25.3)	157.9 ± 18.7	127.3 ± 26.2	17/30/28
M1	34/41	82.5 ± 7.0	72.7 ± 14.2	16(21.3)	26 (34.7)	20 (26.7)	159.8 ± 17.6	126.8 ± 24.5	15/31/29
M2	37/38	83.5 ± 6.5	72.5 ± 15.5	19 (25.3)	24 (32.0)	18 (24.0)	161.1 ± 16.5	134.3 ± 30.4	18/28/29
M3	35/40	83.0 ± 7.0	73.5 ± 13.5	17 (22.7)	25 (33.3)	20 (26.7)	158.7 ± 19.3	131.5 ± 28.2	16/29/30

Abbreviations: HBP high blood pressure, RBC red blood cell, JHS, junior high school, HS high school